[HELP] Triple combination of buttons at a time - Not working

[icebreaker]

Platform: Mobile phone, Android 4.4.2

I use PPSSPP for playing DBZ tenkaichi tag team. If anyone has played this game, the person must be aware of the super / ultimate attacks that require the user to press 3 buttons together at the same time. Unfortunately, I am not able to do that. (I can press 2 buttons at a time but not 3)

Can anyone tell me if it's a problem of my device or something else?

Please suggest me solutions to overcome this problem whether it's from my phone or PPSSPP.
Would really appreciate your help.

[Trokinos]

No idea for phones, but for PC, you can setup a specific game config for your game and change your controls so you assign the same key to several psp control

By example, if you assign the key Q to the X, O and Triangle actions, if you press Q during the game , it will consider you will have pressed X, O and Triangle at the same time.

[icebreaker]

Is there any possibility of doing something similar in mobile phones? (Android)

Or maybe if I get a virtual keyboard for my device (if there is any), will PPSSPP accept the inputs from it?